Rasp handle adapter

ABSTRACT

Disclosed herein are rasp adapters, rasp systems, and method of use thereof. The rasp adapter can include a body and a retention element. The body can define a body cavity, a handle opening, and a trunnion bore. The retention element can be located within the body cavity and can include a knuckle and a heal. The knuckle can be located proximate to and movable into and out of the trunnion bore. The heal can be located proximate the handle opening. Movement of the retention element due to a force applied to the heal can cause movement of the retention element and movement of the knuckle into the trunnion bore.

PRIORITY CLAIM

The present application claims the benefit of priority to U.S.Provisional Application No. 62/965,543, filed Jan. 24, 2020, thecontents of which is hereby incorporated by reference in its entirety.

FIELD OF THE DISCLOSURE

The present disclosure relates to adapters. Specifically, the presentdisclosure relates to rasp handle adapters and methods of use thereof.

BACKGROUND

During various surgical procedures, a rasp can be used to prepare a boneto receive an implant. For example, during a hip arthroplasty procedurea stem can be implanted into a femur. However, before the stem can beimplanted, a rasp can be used to prepare the femoral canal. The rasp canbe removably connected to a rasp handle. By having the rasp be removablyconnected to the rasp handle, different rasps each having a differentsize and/or roughness can be connected to the rasp handle.

SUMMARY

The following, non-limiting examples, detail certain aspects of thepresent subject matter to solve the challenges and provide the benefitsdiscussed herein, among others.

Example 1 is a rasp adapter comprising: a body that defines a bodycavity, a handle opening, and a trunnion bore; and a retention elementlocated within the body cavity, the retention element including: aknuckle located proximate to and movable into and out of the trunnionbore, and a heal located proximate the handle opening, wherein movementof the retention element due to a force applied to the heal causesmovement of the retention element and movement of the knuckle into thetrunnion bore.

In Example 2, the subject matter of Example 1 optionally includeswherein the retention element is coupled to the body via a spring.

In Example 3, the subject matter of any one or more of Examples 1-2optionally include a trunnion protruding from a superior surface of thebody, the trunnion defining at least one trunnion notch.

In Example 4, the subject matter of Example 3 optionally includeswherein the trunnion, the retention element, and the body are amonolithic component.

In Example 5, the subject matter of any one or more of Examples 1-4optionally include a protrusion extending from an inferior surface ofthe body.

In Example 6, the subject matter of any one or more of Examples 1-5optionally include a stop located proximate the knuckle.

In Example 7, the subject matter of any one or more of Examples 1-6optionally include wherein a surface of the body cavity defines an archstructure with an apex proximate the knuckle.

In Example 8, the subject matter of any one or more of Examples 1-7optionally include wherein the knuckle defines a lead in proximate thetrunnion bore.

In Example 9, the subject matter of any one or more of Examples 1-8optionally include a pin pivotably coupling the retention element to thebody.

In Example 10, the subject matter of any one or more of Examples 1-9optionally include a biasing element located within the body cavity andarranged to bias the knuckle into the trunnion bore.

Example 11 is a rasp adapter comprising: a body having an interiorsurface that defines a body cavity, a handle opening, and a trunnionbore; a trunnion protruding from a superior surface of the body; abiasing element located within the body cavity; and a retention elementlocated within the body cavity and coupled to the body via the biasingelement, the retention element including: a knuckle located proximate toand moveable into and out of the trunnion bore, and a heal locatedproximate the handle opening, wherein movement of the retention elementdue to a force applied to the heal causes movement of the retentionelement and movement of the knuckle into the trunnion bore.

In Example 12, the subject matter of Example 11 optionally includeswherein the biasing element comprises a plurality of spring legs.

In Example 13, the subject matter of any one or more of Examples 11-12optionally include wherein the trunnion defines at least one trunnionnotch.

In Example 14, the subject matter of any one or more of Examples 11-13optionally include a protrusion extending from an inferior surface ofthe body.

In Example 15, the subject matter of any one or more of Examples 11-14optionally include wherein the interior surface of the body cavitydefines an arch structure with an apex proximate the knuckle.

In Example 16, the subject matter of any one or more of Examples 11-15optionally include wherein the knuckle defines a lead in proximate thetrunnion bore.

In Example 17, the subject matter of any one or more of Examples 11-16optionally include wherein the biasing element, the retention element,and the body are a monolithic component.

Example 18 is a rasp system comprising: a handle having a first end thatdefines a first trunnion bore and a handle pin; and a plurality ofadapters, each of the plurality of adapters comprising: a body having aninterior surface that defines a body cavity, a handle opening sized toreceive the handle pin, and a second trunnion bore; a trunnionprotruding from a superior surface of the body, the trunnion defining atleast one trunnion notch; a biasing element located within the bodycavity; and a retention element located within the body cavity andcoupled to the body via the biasing element, the retention elementincluding a knuckle located proximate to and moveable into and out ofthe second trunnion bore, and a heal located proximate the handleopening, wherein the biasing element of at least one of the plurality ofadapters comprises a plurality of spring legs, wherein the knuckle of atleast one of the plurality of adapters defines a lead in proximate thesecond trunnion bore, wherein upon insertion of the handle pin into thehandle opening and the trunnion into the first trunnion bore, the handlepin contacts the heal and causes the knuckle to move into the secondtrunnion bore, wherein a combination of trunnion and second trunnionbore sizes differs for each of the plurality of adapters.

In Example 19, the subject matter of Example 18 optionally includeswherein at least one of the plurality of adapters comprises a protrusionextending from an inferior surface of the body.

In Example 20, the subject matter of any one or more of Examples 18-19optionally include wherein the interior surface of at least one of theplurality of adapters defines an arch structure with an apex proximatethe knuckle.

In Example 21, the rasp adaptor or rasp systems of any one or anycombination of Examples 1-20 can optionally be configured such that allelements or options recited are available to use or select from.

BRIEF DESCRIPTION OF THE FIGURES

In the drawings, which are not necessarily drawn to scale, like numeralscan describe similar components in different views. Like numerals havingdifferent letter suffixes can represent different instances of similarcomponents. The drawings illustrate generally, by way of example, butnot by way of limitation, various embodiments discussed in the presentdocument.

FIG. 1 shows rasp geometries in accordance with at least one example ofthe present disclosure.

FIG. 2 shows a rasp system in accordance with at least one example ofthe present disclosure.

FIG. 3 shows a detail of the rasp system shown in FIG. 2 in accordancewith at least one example of the present disclosure.

FIGS. 4A, 4B, 4C, and 4D each shows a rasp adapter in accordance with atleast one example of the present disclosure.

FIGS. 5A, 5B, 5C, 5D, and 5E show a method for assembling a rasp systemin accordance with at least one example of the present disclosure.

Corresponding reference characters indicate corresponding partsthroughout the several views. The exemplifications set out hereinillustrate exemplary embodiments of the disclosure, and suchexemplifications are not to be construed as limiting the scope of thedisclosure in any manner.

DETAILED DESCRIPTION

Rasps, also referred to as broaches, made by different manufacturesand/or different generations of rasps from the same manufacturer canhave different connection geometries. The different connectiongeometries can make it difficult and/or impossible to utilize a singlerasp handle with the differing rasps. The different connectiongeometries also can make it difficult and/or impossible to utilizedifferent rasp handles for an individual rasp. For example, a surgeonmay prefer to use a particular rasp that has a connection geometry for afirst rasp handle, but due to size constraints or familiarity with aparticular rasp handle the surgeon may not be able to use the particularrasp handle and may have to use a second rasp handle.

As disclosed herein, a rasp adapter can allow the use of rasps and rasphandles that have different connection geometries. As a result, surgeonsthat have developed a preference for a particular rasp handle based ontheir approach and experience, can use different rasps or vice versa.Without the rasp adapters disclosed herein, new rasp handles and/orrasps have to be designed and manufactured mimicking the preferredhandle design with a modified connection linkage. Furthermore, surgeonstypically require multiple rasp handles to accommodate multiplesurgeries occurring in a single day and the asymmetric nature of somehandles (i.e. handle designed to access left and right sides of thepatient's body). Design and regulatory approval of new rasp handles andrasps can consume a lot of human and financial capital and take upwardsof 12 months or longer. Production of each new handle can cost severalthousands of dollars as well.

The adapters disclosed herein allow for a simplified component that canbe manufactured at a reduced cost and delivery time to allow a singlehandle to be used with rasps having different connection geometries thanthe handle. Further, the adapters disclosed herein can allow surgeons toselect any of the already existing rasps handles that are available fromdifferent manufacturers or generations of rasp handles.

The adapters disclosed herein can include a male post geometry,sometimes referred to as a trunnion, on a superior face that mimics therasp post designed to mate with the preferred handle. The inferiorsurface of the adapters can have a complementary female geometrydesigned to connect to the male rasp post of the preferred rasp and/orstem system. Additionally, the inferior surface can incorporate ananti-rotation feature, such as a tab, peg, or other protrusion that canmimic that of the rasp handle designed to mate with the preferred raspand/or stem system.

The adapters disclosed herein also can have an integral biasing member,such as a spring feature, that allows for easy assembly and disassemblyonto the rasps using only manual forces instead of special fixturesand/or tooling. The biasing element can be designed to stiffen and lockonce the rasp handle engages the adapter to prevent the assembly fromseparating while under working loads during bone preparation (e.g.,impaction and retraction).

As disclosed herein, multiple adapters can be used during a singlesurgery such that multiple rasps sizes can be assembled to expedite tothe rasping process. The rasp handle can then be assembled to eachrasp/adapter assembly and the bone prepared. Once the final rasp/adapterassembly has been utilized, the surgeon can select to trial off the raspand thus remove the handle and adapter to allow for the trunnion trialsto be installed. At this point the surgeon can disconnect the rasphandle with the rasp/adapter remaining in the canal of the bone (e.g., afemoral canal). The removal of the rasp handle can alleviate the lockallowing the surgeon to manually remove the adapter from the rasp. Aftersuccessful trialing, the surgeon can replace the adapter and then therasp handle to remove the rasp from the prepared bone.

Turning now to the figures, FIG. 1 illustrates proximal portions ofrasps 100 and 150 in accordance with at least one example of the presentdisclosure. As shown in FIG. 1 , rasp 100 can include a body 102 and atrunnion 104. Trunnion 104 can extend from a superior surface 106 anddefine a notch 108. Rasp 150 can include a body 152 and a trunnion 154.Trunnion 154 can extend from a superior surface 156 and define a notch158.

Each of rasps 100 and 150 can be from the same manufacturer or differentmanufacturers. For example, rasp 100 can be a rasp manufactured by afirst manufacturer and rasp 150 can be a rasp manufactured by a secondmanufacturer. Rasps 100 and 150 can also be manufactured by the samemanufacturer but be different generations or designs for rasps.

Because rasps 100 and 150 are manufactured by two differentmanufacturers or are different generations and/or designs, the geometryfor connecting rasps 100 and 150 to a handle can be different. Forexample, as shown in FIG. 1 , the height of trunnions 104 and 154 mayhave a height difference represented by ΔH. Notches 108 and 158 can bedifferent as well. For instance, notch 108 can have a “V” shape thatincludes two straight portions 110 and a curved bottom 112. Notch 158can have a curved structure 160 of a constant radius, R. The differencesin trunnion height and notch structure can prevent rasps 100 and 150from being attachable to a single handle.

FIG. 2 shows a rasp system 200 in accordance with at least one exampleof the present disclosure. Rasp system 200 can include a handle 202, anadapter 204, and a rasp 206. Rasp 206 can have a connection geometrysimilar to that of rasp 100 or rasp 150. As disclosed herein, rasp 206has a connection geometry similar to that of rasp 150. Handle 202 caninclude a lever 208 that connects to a linkage 210. As shown in FIG. 2 ,handle 202 can include a first end 212 and a second end 214. Adapter 204can be connected to first end 212 and an impaction head 216 can beconnected to second end 214. Impaction head 216 can be removable toallow for customization of handle 202 and for replacement due to wearand tear over time.

FIG. 3 shows a detail of adapter 204 and rasp 206 connected to handle202. As disclosed herein, movement of lever 208 can cause movement oflinkage 210 and a lock 302 so as to secure and release adapter 204 andrasp 206 to and from handle 202. As shown in FIG. 3 , adapter 204 caninclude a trunnion 304 that defines a trunnion notch 306 and is locatedwithin a trunnion bore 308. In a locked state, a projection 310 of lock302 can rest at least partially in trunnion notch 306 to secure adapter204 to handle 202.

Handle 202 can include a pin 312 that extends from first end 212. Uponpin 312 entering adapter 204, via a handling opening 314, pin 312 cancontact a retention element 316. For example, pin 312 can contact a heal318 thereby causing a knuckle 320 to contact notch 158 thereby securingboth adapter 204 and rasp 206 to handle 202.

FIGS. 4A, 4B, and 4C shows adapter 204 in accordance with at least oneexample of the present disclosure. Adapter 204 can include a body 402that can include a superior surface 404, an inferior surface 406, and aninterior surface 410. Trunnion 304 can extend from superior surface 404.The trunnion 304 can define one or more trunnion notches 306. Forexample, trunnion 304 can have a length that allows for two trunnionnotches to be formed thereby allowing adapter 204 to accommodate handlesthat have locks, such as lock 302, positioned different distances from afirst end of a handle, such as first end 212 of handle 202. Trunnion 304can also include a beveled surface 414. Beveled surface 414 can providea transition to ease inserting adapter 204 into handle 202. For example,beveled surface 414 can contact lock 302 in order to cause lock 302 tomove out of trunnion bore 308 when adapter 204 is inserted into handle202.

The diameter of trunnion 304 can be constant and/or can vary. Forexample, the diameter of trunnion 304 can be constant as shows in FIGS.4A-4C. the diameter of trunnion 304 can also vary as a function ofdistance from superior surface 404. For instance, trunnion 304 can havea slight conical shape.

Trunnion 304 and body 402 can be a monolithic component. For example,adapter 204 can be machined from a solid billet of metal such thattrunnion 304 and body 402 are one continuous piece of metal. Stillconsistent with embodiments disclosed herein, trunnion 304 can be athreaded component that screws into body 402. For example, trunnion 304can be machined from round stock with a threaded end and body 402 caninclude a tapped hole to allow trunnion 304 to be threaded into body402.

Superior surface 404 can define handle opening 314. The size and shapeof handle opening 314 can vary from one adapter to another. For example,adapter 204 can be one of a plurality of adapters that are part of arasp system. Each of the adapters can have handle openings that varydepending on the handle in which they are designed to accommodate. Asshown in FIGS. 4A and 4C, handle opening 314 can be circular. Stillconsistent with embodiments disclosed herein, handle opening 314 can berectangular, oval shaped, pentagonal shaped, etc. Handle opening 314 candefine a passage from the exterior of adapter 204 to a cavity 416defined by interior surface 410. The passage can allow pin 312 to passinto cavity 416 and contact heal 318 of retention element 316.

As disclosed herein, retention element 316 can include heal 318 andknuckle 320. Retention element 316 can be secured to body 402 via abiasing element 418. Biasing element 418 can bias knuckle 320 intotrunnion bore 420 defined by body 402. By having biasing element 418biased into trunnion bore 420, when the trunnion of a rasp, such astrunnion 154 of rasp 206, is inserted into trunnion bore 420, knuckle320 can move into a notch, such as notch 158 in trunnion 154, totemporarily secure the rasp to adapter 204. The biasing force applied bybiasing element 418 can be high enough to secure rasp 202 to adapter 204during general handling by surgeons or other operating room personnelbut not so high as to require any special tools or other instruments tosecure and/or remove trunnion 154 from adapter 204.

Biasing element 418 can be comprised of multiple elements. For example,as shown in FIGS. 4A-4C, biasing element 418 can be comprised of aplurality of spring legs 422 that can be connected together via curvedportions 430. Other examples of biasing element 418 can include springs,such as torsional or compression springs.

Interior surface 410 can include an arched portion proximate retentionelement 318. The arched portion of interior surface 410 can have an apexthat is located proximate retention element 318. As described below withrespect to FIGS. 5A-5E, the arched portion of interior surface 410 canact as a stop to limit motion of retention element 318. In addition toor an in alternative to the arched portion of interior surface 410, atab or other protuberance can extend from interior surface 410 to limitmovement of retention element 318 when handle 202 is connected toadapter 204.

Adapter 204 can include a protrusion 424 that extends from inferiorsurface 406. As disclosed herein, protrusion 424 can mate with acomplementary recess in rasp 206. While adapter 204 is shown anddescribed as having protrusion 424 and rasp 206 as having thecomplementary recess, adapter 204 can have a complementary recess andrasp 206 can have a protrusion without departing from contemplatedembodiments. Protrusion 424 can act to prevent rotation of rasp 206 inadapter 204.

As disclosed herein retention element 316 can include heal 318 andknuckle 320. Knuckle 320 can include a lead in 426. Lead in 426 can be abeveled portion or other angled surface of knuckle 320. Lead in 426 canallow a trunnion of a rasp, such as trunnion 154 of rasp 206 to moveretention element 316 due to contact between the two elements, therebytemporarily moving retention element 316 out of trunnion bore 420. Upona notch, such as notch 158, passing knuckle 320, knuckle 320 can moveback into trunnion bore 420 and contact notch 158, thereby temporarilysecuring rasp 206 to adapter 204. The surface of knuckle 320 thatcontact notch 158 can be contoured to match notch 158. For example,notch 158 has a curved shape so the surface of knuckle 320 that contactsnotch 158 can be curved as well. Notch 108 (see FIG. 1 ) has planarsurface 110 so the surface of knuckle 320 that contacts notch 108 can beplanar as well.

Adapter 204 can be manufactured from metals, polymers, ceramics, or anycombination thereof. Adapter 204 can be manufactured via a variety ofmanufacturing techniques including, but not limited to, machining (CNCor manual), injection molded, overmolding, etc. For example, adapter 204can be machined from a single metal billet (i.e. be a monolithiccomponent). Adapter 204 can also be machined from a metal billet andovermolded with a rubber or other polymer. Various surfaces of adapter204 can be overmolded or otherwise coated as well. For example, superiorsurface 404 and/or inferior surface 406 can be coated with a polymer orceramic to help minimize wear between superior surface 404 and/orinferior surface 406 and surfaces of handle 202 and rasp 206.

FIG. 4D shows adapter 450 in accordance with at least one example of thepresent disclosure. Adapter 450 can include a body 452 that can includea superior surface 454, an inferior surface 456, and an interior surface458. Trunnion 304 can extend from superior surface 454. Trunnion 304 candefine one or more trunnion notches 306 and a beveled surface 414 asdisclosed with respect to FIGS. 4A-4C.

Adapter 450 can include a retention element 470 that can include a heal458 and knuckle 460. Retention element 460 can be secured to body 402via a biasing element 462. Biasing element 462 can bias knuckle 464 intotrunnion bore 420 defined by body 402. By having biasing element 462biased into trunnion bore 420, when the trunnion of a rasp, such astrunnion 154 of rasp 206, is inserted into trunnion bore 420, knuckle464 can move into a notch, such as notch 158 in trunnion 154, totemporarily secure the rasp to adapter 204 as disclosed herein.

Biasing element 462 can be comprised of multiple elements. For example,as shown in FIG. 4D, biasing element 462 can be comprised of a pluralityof spring legs 466 connected by arched portions 430. Other examples ofbiasing element 462 can include springs, such as torsional orcompression springs. Spring legs 466 can be angled relative to the axisof trunnion bore 420 to provide additional clearance. In addition and asshown in FIG. 4D, individual legs of spring legs 464 can have differentlengths relative to one another.

Interior surface 468 can be flat and retention element 460 can includean arched portion 472 proximate interior surface 468. Arched portion 472can have an apex that is located proximate interior surface 468. Asdescribed herein, arched portion 472 and of interior surface 468 can actas a stop to limit motion of retention element 460. Interior surface 468can also define a radius 474 that can act as a stop to limit motion ofretention element 460 via contact with radius 474.

In addition to or an in alternative to arched portion 472, a tab orother protuberance can extend from retention element 460 or interiorsurface 468 to limit movement of retention element 460 when handle 202is connected to adapter 204.

Adapter 450 can be manufactured from metals, polymers, ceramics, or anycombination thereof. Adapter 450 can be manufactured via a variety ofmanufacturing techniques including, but not limited to, machining (CNCor manual), injection molded, overmolding, etc. For example, adapter 450can be machined from a single metal billet (i.e. be a monolithiccomponent). Adapter 450 can also be machined from a metal billet andovermolded with a rubber or other polymer. Various surfaces of adapter450 can be overmolded or otherwise coated as well. For example, superiorsurface 454 and/or inferior surface 456 can be coated with a polymer orceramic to help minimize wear between superior surface 454 and/orinferior surface 456 and surfaces of handle 202 and rasp 206.

FIGS. 5A, 5B, 5C, 5D, and 5E show method stages for assembling raspsystem 200 in accordance with at least one example of the presentdisclosure. The method can begin at stage 502 (FIG. 5A) where rasp 206can be connected to adapter 204. To connect rasp 206 to adapter 204trunnion 154 can be inserted into trunnion bore 420 as indicated byarrow 504 and pin 424 can be inserted into a recess 506 located in rasp206 as indicated by arrow 508. As shown in FIG. 5B (stage 510), upontrunnion 154 entering cavity 416 a beveled surface 512 of trunnion 154can contact lead in 416. Upon contacting lead in 416 trunnion 154 cancause movement, such as rotation and/or translation, as indicated byarrow 514, of retention element 316 so that knuckle 320 moves out oftrunnion bore 420. Upon notch 158 passing knuckle 320, knuckle 320 canseat into notch 158 as shown in FIGS. 3 and 5C.

At stage 516 (FIG. 5C) trunnion 304 can be inserted into trunnion bore308 as indicated by arrow 518. As trunnion 304 passes through trunnionbore 308, pin 312 can enter handle opening 314 as indicated by arrow520. During stage 516, biasing element 422 can bias retention element316 so that knuckle 320 holds rasp 206 in place. As trunnion 304 passesthrough trunnion bore 308, trunnion notch 306 can pass projection 310 asshown in FIG. 5D.

At stage 522 (FIG. 5D.) pin 312 can seat into handling opening 314 andprotrusion 310 can be moved into trunnion notch 306. Movement ofprotrusion 310 and lock 302 can be caused by movement of level 208.

FIG. 5E shows rasp 206 secured to adapter 204, which is in turn securedto handle 202. As shown in FIG. 5E, pin 312 resting against heal 314 canact to constrict movement of retention element 316. In addition, theapex of interior surface 410 also can act to constrict movement ofretention element 316. As shown in FIG. 5E, a downward force (indicatedby arrow 526) can cause retention element 316 to move as indicated byarrow 528 and contact the curved portion or the apex of interior surface410. The contact between knuckle 320 and interior surface 410 along withcontact of pin 312 and heal 314 locks rasp 206 to adapter 204. Statedanother way, by constricting movement of retention element 316 withinterior surface 410 and pin 312, knuckle 320 forms a wedge that securesrasp 206 to adapter 204.

To remove rasp 206 from adapter 204, handle 202 can be removed so thatpin 312 no longer restricts movement of retention element 316. Forexample, handle 202 can be removed from adapter 204. Once handle 202 isremoved, retention element 316 is free to move as indicated by arrow 530and rasp 202 can be pulled from adapter 204. For instance, as rasp 202is pulled from adapter, the surface of knuckle 320 that contacts notch158 can slide along notch 158 thereby pushing retention element out oftrunnion bore 420 as indicated by arrow 530.

NOTES

The above detailed description includes references to the accompanyingdrawings, which form a part of the detailed description. The drawingsshow, by way of illustration, specific embodiments in which theinvention can be practiced. These embodiments are also referred toherein as “examples.” Such examples can include elements in addition tothose shown or described. However, the present inventors alsocontemplate examples in which only those elements shown or described areprovided. Moreover, the present inventors also contemplate examplesusing any combination or permutation of those elements shown ordescribed (or one or more aspects thereof), either with respect to aparticular example (or one or more aspects thereof), or with respect toother examples (or one or more aspects thereof) shown or describedherein.

In the event of inconsistent usages between this document and anydocuments so incorporated by reference, the usage in this documentcontrols.

In this document, the terms “a” or “an” are used, as is common in patentdocuments, to include one or more than one, independent of any otherinstances or usages of “at least one” or “one or more.” In thisdocument, the term “or” is used to refer to a nonexclusive or, such that“A or B” includes “A but not B,” “B but not A,” and “A and B,” unlessotherwise indicated. In this document, the terms “including” and “inwhich” are used as the plain-English equivalents of the respective terms“comprising” and “wherein.” Also, in the following claims, the terms“including” and “comprising” are open-ended, that is, a system, device,article, composition, formulation, or process that includes elements inaddition to those listed after such a term in a claim are still deemedto fall within the scope of that claim. Moreover, in the followingclaims, the terms “first,” “second,” and “third,” etc. are used merelyas labels, and are not intended to impose numerical requirements ontheir objects.

The above description is intended to be illustrative, and notrestrictive. For example, the above-described examples (or one or moreaspects thereof) can be used in combination with each other. Otherembodiments can be used, such as by one of ordinary skill in the artupon reviewing the above description. The Abstract is provided to complywith 37 C.F.R. § 1.72(b), to allow the reader to quickly ascertain thenature of the technical disclosure. It is submitted with theunderstanding that it will not be used to interpret or limit the scopeor meaning of the claims. Also, in the above Detailed Description,various features can be grouped together to streamline the disclosure.This should not be interpreted as intending that an unclaimed disclosedfeature is essential to any claim. Rather, inventive subject matter canlie in less than all features of a particular disclosed embodiment.Thus, the following claims are hereby incorporated into the DetailedDescription as examples or embodiments, with each claim standing on itsown as a separate embodiment, and it is contemplated that suchembodiments can be combined with each other in various combinations orpermutations. The scope of the invention should be determined withreference to the appended claims, along with the full scope ofequivalents to which such claims are entitled.

What is claimed is:
 1. A rasp adapter comprising: a body that defines a body cavity, a handle opening, and a trunnion bore; and a retention element located within the body cavity, the retention element including: a knuckle located proximate to and movable into and out of the trunnion bore, and a heal located proximate the handle opening, wherein movement of the retention element due to a force applied to the heal causes movement of the retention element and movement of the knuckle into the trunnion bore.
 2. The rasp adapter of claim 1, wherein the retention element is coupled to the body via a spring.
 3. The rasp adapter of claim 1, further comprising a trunnion protruding from a superior surface of the body, the trunnion defining at least one trunnion notch.
 4. The rasp adapter of claim 3, wherein the trunnion, the retention element, and the body are a monolithic component.
 5. The rasp adapter of claim 1, further comprising a protrusion extending from an inferior surface of the body.
 6. The rasp adapter of claim 1, further comprising a stop located proximate the knuckle.
 7. The rasp adapter of claim 1, wherein a surface of the body cavity defines an arch structure with an apex proximate the knuckle.
 8. The rasp adapter of claim 1, wherein the knuckle defines a lead in proximate the trunnion bore.
 9. The rasp adapter of claim 1, further comprising a pin pivotably coupling the retention element to the body.
 10. The rasp adapter of claim 1, further comprising a biasing element located within the body cavity and arranged to bias the knuckle into the trunnion bore.
 11. A rasp adapter comprising: a body having an interior surface that defines a body cavity, a handle opening, and a trunnion bore; a trunnion protruding from a superior surface of the body; a biasing element located within the body cavity; and a retention element located within the body cavity and coupled to the body via the biasing element, the retention element including: a knuckle located proximate to and moveable into and out of the trunnion bore, and a heal located proximate the handle opening, wherein movement of the retention element due to a force applied to the heal causes movement of the retention element and movement of the knuckle into the trunnion bore.
 12. The rasp adapter of claim 11, wherein the biasing element comprises a plurality of spring legs.
 13. The rasp adapter of claim 11, wherein the trunnion defines at least one trunnion notch.
 14. The rasp adapter of claim 11, further comprising a protrusion extending from an inferior surface of the body.
 15. The rasp adapter of claim 11, wherein the interior surface of the body cavity defines an arch structure with an apex proximate the knuckle.
 16. The rasp adapter of claim 11, wherein the knuckle defines a lead in proximate the trunnion bore.
 17. The rasp adapter of claim 11, wherein the biasing element, the retention element, and the body are a monolithic component.
 18. A rasp system comprising: a handle having a first end that defines a first trunnion bore and a handle pin; and a plurality of adapters, each of the plurality of adapters comprising: a body having an interior surface that defines a body cavity, a handle opening sized to receive the handle pin, and a second trunnion bore; a trunnion protruding from a superior surface of the body, the trunnion defining at least one trunnion notch; a biasing element located within the body cavity; and a retention element located within the body cavity and coupled to the body via the biasing element, the retention element including a knuckle located proximate to and moveable into and out of the second trunnion bore, and a heal located proximate the handle opening, wherein the biasing element of at least one of the plurality of adapters comprises a plurality of spring legs, wherein the knuckle of at least one of the plurality of adapters defines a lead in proximate the second trunnion bore, wherein upon insertion of the handle pin into the handle opening and the trunnion into the first trunnion bore, the handle pin contacts the heal and causes the knuckle to move into the second trunnion bore, wherein a combination of trunnion and second trunnion bore sizes differs for each of the plurality of adapters.
 19. The rasp system of claim 18, wherein at least one of the plurality of adapters comprises a protrusion extending from an inferior surface of the body.
 20. The rasp system of claim 18, wherein the interior surface of at least one of the plurality of adapters defines an arch structure with an apex proximate the knuckle. 